Caster



N. L. JARVIS ET AL CASTER May 8, 1928. I 1,669,165

Filed Dec. 22, 1925 gwuc'n roz "nelson Lzzlarvis. Frank J. \larvis.

I Sa -Am,

V and 6 ofthe body of the roller.

and 6 are made of thin plates bent to shape The draw-s ing of the plates together by the rivets Patented May 8, 1928., p L I N LSON Ii. JARVI Ann maxi! a. news or"; Petunia. assumes-Ems, Assmnoas' '10' JARVIS a JARVIS, mo, OF PAL E MASSACHUSETIS, 4 ooaronacrron' or .MAssAoHUsE'rrs. 3

Application file'd' Dec ember 22, 1922s. se ial nof'zesao.

auxiliary or buffer roller. i i

The principal ob ect of the inventionis to provide a. caster having theregular-roller and in addition thereto a buffer or lnuiiper roller that will prevent the'objectto which the caster is applied from coming in contact with walls orbase boards Inthe room in which it is used or with furniturepr other articles. 7 r

Other objects are to'provide an improved construction ofshelli'raine rollers and bump er rollers, improved means of securing the rubber tire in the roller, improved friction means for holding the stem and caster sleeve, and improved bearing means of the stem in the sleeve.

Another object is to provide an economic, light, strong, caster.

The invention provides these and other.

objects which will become apparent from the drawings and the following description. The preferred form only of the invention is shown by way of illustration. Many changes of the details of construction and the ar-- rangement of parts may be made without departing from the spirit of the invention as expressed in the claims andas such are av part of the invention. We, therei'0re, do not desire to be limited to the specific details v I forming the ends of the bearing. The washshown anddescribed.

Referring to the drawlngs 1n \VlllCllSlHll-i lar reference characters designate similar parts throughout:

ure 2. r

The main roller support 1 is bifurcated in the form of a fork. The caster roller 2 is lo-' eatedbetween the bifurcations of the support and rotatably secured thereto by the axle pin 3. i The caster roller 2 comprises a rubber tire 4 held between the two halves '5 and held together by the rivets 7.

clamps the rubber tire and holds it in place,

easily working and eflicient Figure 3 is a section on line 3-3 of Fig- The parts 5 The inner port-ion of the" plates 5 and f6fis flanged at 8'and'9 to forniabean 1g surface for the roller on the axle-pinfl.

Rismg from 1 the roller support 1 is the caster stem 10 which has a-reducedshank '11 forming a' 'sho'ulder, 12'wl1ich bearsfonthe inner 'walls of the opening in the roller sup port. The outer end of the shank 11 is riveted o\'*or-t he roller support, "thus: rigidly securing thestem tothe roller support.

I Over thei caster stem 10 is fitted ,the caster sleeve 13- "which hasja' central bore into which thevstcnn is' slipped; thecentral boreterminating a short distance beyond the end of the stern. Between the end of the stem and the end of the centralbore is placed a ball 14 which acts as, a thrust bearing for the sleeve on. the stem. The sleeve 13 is rotatable on the stem 10. The sleeve '13is frictionally held on the stem 10 by a friction spring 15 in a groove ends of the spring do not quite meet, hence the spring expands and engages the sides of the bore in thesleeve preventing the stem from slipping longitudinally in the bore. On the outside of the caster sleeve 13 is a similar springl'fin the groove 18 designed 16 inthe stem 10. The

to hold the caster sleeve inthe object to er 21 rests on the shoulder 22' and is screwed to or-otherwise secured to the caster sleeve to retain it in. place on the shoulder 22. ()n the bearing 19 between the shoulder 20 and the washer 2-1 is rotatably mounted the sis,

bumper wheel 23, similar in construction to 1 the roller wheel 2, comprising the body plates 24 and'25 having'the bearing flanges 26 and 27 bearing on the hub or boss 19 of the caster sleeve 13, and held together by 28 and embracing the rubber the rivets tire 29. p

The operation of the caster is as follows: The caster sleeve. 13 is held in the object to 'which it applied by the friction sprin '17. The caster stem 10 is held in the caster s eeve 13 by the friction spring lo; relative rotative movement between the stem 10 and sleeve 13 is permitted by the fit of the stem into the bore of the; sleeve and by means of the p ball thrust bearing Lt between the end of the stem and the end o fthe bore in the sleeve. The roller support' 1 moves with the stem and the roller 2 rotates on the axle pin 3 secured to theroller support. The

liun'ip'er wh ccl 23 rotates on its bearing on the caster sleeve 13 and projects far enough beyond the object to which the caster is attached to prevent the object coming in c6'n tact With other objects in its vicinity. The Washer 21 holds the bumper roller 23 in place on its bearing. The floor roller and thebumper roller are in planes at right angles to each other.

From the toregomg description it Will be seen that We have provided a simple. light,

economic and et'ficientdevice forcarrymg forththe objects and advantages herein set forth, as Well as for other purposesf Having described our invention, we claim:

1,111 a device or the character described,

a roller support, a caster stem secured to the roller support, acaster sleeve rotatably mounted on 'thestem andhavmg a flange adjacent the support and a bearing surface adjacent to the flange, a bumper roller ro tatably fmountedon the bearing portion of the sleeve and a spacer member to hold the bumper roller on the bearing on the sleeve.

2. In a device of the chara'cter"described,

a roller support, a caster stem secured to the support and projecting beyond the same,

'a'caster sleeve having an internal bore r0- tatablv 'nounted onthe caster stem and having a flange abutting the support and a bearing surface adjacent the flange, a ball member-in the bore of the caster sleeve be- 

